求高手来解答个,该怎么处理

package Bank;

//Create New Class BankAccount
public class BankAccount {
	private long accountNum;
	private long passWord;
	private String name;
	private long ID;
	private long balance;
	
	public BankAccount(){
		this.balance=0;
	}
//	public BankAccount(long a,long p,String n,long ID,long b){
//		this.accountNum=a;
//		this.passWord=p;
//		this.name=n;
//		this.ID=ID;
//		this.balance=b;
//	}
	public long getAccountNum(){
		return this.accountNum;
	}
	public long getPassWord(){
		return this.passWord;
	}
	public String getName(){
		return this.name;
	}
	public long getID(){
		return this.ID;
	}
	public long getBalance(){
		return this.balance;
	}
	public void setAccountNum(long a){
		this.accountNum=a;
	}
	public void setPassWord(long p){
		this.passWord=p;
	}
	public void setName(String n){
		this.name=n;
	}
	public void setID(long ID){
		this.ID=ID;
	}
	public void setBalance(long b){
		this.balance=b;
	}
	public boolean comparePassWord(long i,long j){
		if(i==j)
			return true;
		else
			return false;
	}
	public void printIfo(){
		System.out.println("AccountNumber: "+getAccountNum()+"\nName: "+getName()+"\nBalance: "+getBalance());
	}
}

package Bank;

//Operations of Bank
import java.util.Scanner;
public class BankMethods{
	BankAccount acc=new BankAccount();
	Scanner input=new Scanner(System.in);
	long accountNum,passWord,ID,balance;
	String name;
	
	//注册
	public void Register(){
		//用户名
		System.out.println("Input Your Account Number: ");
		accountNum=input.nextLong();
		boolean flag=true;
		while(flag){
			if((accountNum>=1*Math.pow(10,16))||(accountNum<1*Math.pow(10,15))){
				System.out.println("Wrong Accounmt number, input again: ");
				Scanner input=new Scanner(System.in);
				accountNum=input.nextLong();
				flag=true;
				}
			else{
				acc.setAccountNum(accountNum);
				System.out.println("AccountNumber Aviliable.");
				flag=false;
			}
		}
		//设置密码
		System.out.println("Input Your PassWord: ");
		passWord=input.nextLong();
		boolean flag1=true;
		while(flag1){
			if((passWord>=1*Math.pow(10,6))||(passWord<1*Math.pow(10,5))){
			System.out.println("Wrong Number, input again: ");
			Scanner input=new Scanner(System.in);
			passWord=input.nextLong();
			flag1=true;
			}
			else{
				System.out.println("Input Your PassWord Again: ");
				long passWord1=input.nextLong();
				if(passWord1!=passWord){
					System.out.println("Wrong Number, input again: ");
					passWord=input.nextLong();
					flag1=true;
				}
				else{
					acc.setPassWord(passWord);
					System.out.println("passWord Aviliable.");
					flag1=false;
				}
			}
		}
		//开户人姓名
		System.out.println("Input Your Name: ");
		name=input.next();
		acc.setName(name);
		//身份证号码
		System.out.println("Input Your ID: ");